According to recent pictures of it in the manga, I'd say:
Total length: 215cm
Length of the blade: 170cm
Length of the handle: 45cm
Width at the hilt: 30cm
Width near the tip: 20cm
As for the thickness, I'd say between 4 and 7cm.
You just need to increase the handle length in your estimation basically, other than that it's good to go. Like I told you, you won't find anything more accurate or relevant so you might as well stick with these commonly assumed numbers.